/*
 * Copyright (c) [2021] Huawei Technologies Co.,Ltd.All rights reserved.
 *
 * OpenArkCompiler is licensed under Mulan PSL v2.
 * You can use this software according to the terms and conditions of the Mulan PSL v2.
 *
 *     http://license.coscl.org.cn/MulanPSL2
 *
 * THIS SOFTWARE IS PROVIDED ON AN "AS IS" BASIS, WITHOUT WARRANTIES OF ANY KIND, EITHER
 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO NON-INFRINGEMENT, MERCHANTABILITY OR
 * FIT FOR A PARTICULAR PURPOSE.
 * See the Mulan PSL v2 for more details.
*/


import java.util.concurrent.atomic.AtomicInteger;
public class ThreadId {
    private static final AtomicInteger nextId = new AtomicInteger(0);
    private static final ThreadLocal<Integer> threadId =
            new ThreadLocal<Integer>() {
                @Override
                protected Integer initialValue() {
                    return nextId.getAndIncrement();
                }
            };
    public static int get() {
        return threadId.get();
    }
    public static void main(String[] args) {
        System.out.println(get());
    }
}